>>> Merging sys-boot/silo-1.4.9 to /
/usr/portage/eclass/mount-boot.eclass: line 46: eerror: command not found
/usr/portage/eclass/mount-boot.eclass: line 47: eerror: command not found
/usr/portage/eclass/mount-boot.eclass: line 48: eerror: command not found
/usr/portage/eclass/mount-boot.eclass: line 49: eerror: command not found
/usr/portage/eclass/mount-boot.eclass: line 50: eerror: command not found

Of course, I attempt to mount /dev/sda1 or /dev/sda1 /boot and the system tells me they are already mounted:
[mntent]: line 35 in /etc/fstab is bad
mount: /dev/sda1 already mounted or /boot busy

Line 35 of fstab appears to be the cdrom entry.

If I try umount:
umount: /dev/sda1: not mounted

So, I'm not sure where to go from here. I've searched the forum, but the closest issue with installing SILO seemed to be related to /dev/zero, which is defined on my system.